2 /* pngset.c - storage of image information into info struct
3 *
4 * libpng 1.0.9 - January 31, 2001
5 * For conditions of distribution and use, see copyright notice in png.h
6 * Copyright (c) 1998-2001 Glenn Randers-Pehrson
7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
9 *
10 * The functions here are used during reads to store data from the file
11 * into the info struct, and during writes to store application data
12 * into the info struct for writing into the file. This abstracts the
13 * info struct and allows us to change the structure in the future.
14 */
16 #define PNG_INTERNAL
17 #include "png.h"
19 #if defined(PNG_bKGD_SUPPORTED)
20 void PNGAPI
21 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
22 {
23 png_debug1(1, "in %s storage function\n", "bKGD");
24 if (png_ptr == NULL || info_ptr == NULL)
25 return;
27 png_memcpy(&(info_ptr->background), background, sizeof(png_color_16));
28 info_ptr->valid |= PNG_INFO_bKGD;
29 }
30 #endif
32 #if defined(PNG_cHRM_SUPPORTED)
33 #ifdef PNG_FLOATING_POINT_SUPPORTED
34 void PNGAPI
35 png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
36 double white_x, double white_y, double red_x, double red_y,
37 double green_x, double green_y, double blue_x, double blue_y)
38 {
39 png_debug1(1, "in %s storage function\n", "cHRM");
40 if (png_ptr == NULL || info_ptr == NULL)
41 return;
43 info_ptr->x_white = (float)white_x;
44 info_ptr->y_white = (float)white_y;
45 info_ptr->x_red = (float)red_x;
46 info_ptr->y_red = (float)red_y;
47 info_ptr->x_green = (float)green_x;
48 info_ptr->y_green = (float)green_y;
49 info_ptr->x_blue = (float)blue_x;
50 info_ptr->y_blue = (float)blue_y;
51 #ifdef PNG_FIXED_POINT_SUPPORTED
52 info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
53 info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
54 info_ptr->int_x_red = (png_fixed_point)(red_x*100000.+0.5);
55 info_ptr->int_y_red = (png_fixed_point)(red_y*100000.+0.5);
56 info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
57 info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
58 info_ptr->int_x_blue = (png_fixed_point)(blue_x*100000.+0.5);
59 info_ptr->int_y_blue = (png_fixed_point)(blue_y*100000.+0.5);
60 #endif
61 info_ptr->valid |= PNG_INFO_cHRM;
62 }
63 #endif
64 #ifdef PNG_FIXED_POINT_SUPPORTED
65 void PNGAPI
66 png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
67 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
68 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
69 png_fixed_point blue_x, png_fixed_point blue_y)
70 {
71 png_debug1(1, "in %s storage function\n", "cHRM");
72 if (png_ptr == NULL || info_ptr == NULL)
73 return;
75 info_ptr->int_x_white = white_x;
76 info_ptr->int_y_white = white_y;
77 info_ptr->int_x_red = red_x;
78 info_ptr->int_y_red = red_y;
79 info_ptr->int_x_green = green_x;
80 info_ptr->int_y_green = green_y;
81 info_ptr->int_x_blue = blue_x;
82 info_ptr->int_y_blue = blue_y;
83 #ifdef PNG_FLOATING_POINT_SUPPORTED
84 info_ptr->x_white = (float)(white_x/100000.);
85 info_ptr->y_white = (float)(white_y/100000.);
86 info_ptr->x_red = (float)(red_x/100000.);
87 info_ptr->y_red = (float)(red_y/100000.);
88 info_ptr->x_green = (float)(green_x/100000.);
89 info_ptr->y_green = (float)(green_y/100000.);
90 info_ptr->x_blue = (float)(blue_x/100000.);
91 info_ptr->y_blue = (float)(blue_y/100000.);
92 #endif
93 info_ptr->valid |= PNG_INFO_cHRM;
94 }
95 #endif
96 #endif
98 #if defined(PNG_gAMA_SUPPORTED)
99 #ifdef PNG_FLOATING_POINT_SUPPORTED
100 void PNGAPI
101 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
102 {
103 png_debug1(1, "in %s storage function\n", "gAMA");
104 if (png_ptr == NULL || info_ptr == NULL)
105 return;
107 info_ptr->gamma = (float)file_gamma;
108 #ifdef PNG_FIXED_POINT_SUPPORTED
109 info_ptr->int_gamma = (int)(file_gamma*100000.+.5);
110 #endif
111 info_ptr->valid |= PNG_INFO_gAMA;
112 }
113 #endif
114 #endif
115 void PNGAPI
116 png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
117 int_gamma)
118 {
119 png_debug1(1, "in %s storage function\n", "gAMA");
120 if (png_ptr == NULL || info_ptr == NULL)
121 return;
123 #ifdef PNG_FLOATING_POINT_SUPPORTED
124 info_ptr->gamma = (float)(int_gamma/100000.);
125 #endif
126 #ifdef PNG_FIXED_POINT_SUPPORTED
127 info_ptr->int_gamma = int_gamma;
128 #endif
129 info_ptr->valid |= PNG_INFO_gAMA;
130 }
132 #if defined(PNG_hIST_SUPPORTED)
133 void PNGAPI
134 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
135 {
136 int i;
138 png_debug1(1, "in %s storage function\n", "hIST");
139 if (png_ptr == NULL || info_ptr == NULL)
140 return;
141 if (info_ptr->num_palette == 0)
142 png_warning(png_ptr,
143 "Palette size 0, hIST allocation skipped.");
145 #ifdef PNG_FREE_ME_SUPPORTED
146 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
147 #endif
148 png_ptr->hist = (png_uint_16p)png_malloc(png_ptr,
149 (png_uint_32)(info_ptr->num_palette * sizeof (png_uint_16)));
151 for (i = 0; i < info_ptr->num_palette; i++)
152 png_ptr->hist[i] = hist[i];
153 info_ptr->hist = png_ptr->hist;
154 info_ptr->valid |= PNG_INFO_hIST;
156 #ifdef PNG_FREE_ME_SUPPORTED
157 info_ptr->free_me |= PNG_FREE_HIST;
158 #else
159 png_ptr->flags |= PNG_FLAG_FREE_HIST;
160 #endif
161 }
162 #endif
164 void PNGAPI
165 png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
166 png_uint_32 width, png_uint_32 height, int bit_depth,
167 int color_type, int interlace_type, int compression_type,
168 int filter_type)
169 {
170 int rowbytes_per_pixel;
171 png_debug1(1, "in %s storage function\n", "IHDR");
172 if (png_ptr == NULL || info_ptr == NULL)
173 return;
175 info_ptr->width = width;
176 info_ptr->height = height;
177 info_ptr->bit_depth = (png_byte)bit_depth;
178 info_ptr->color_type =(png_byte) color_type;
179 info_ptr->compression_type = (png_byte)compression_type;
180 info_ptr->filter_type = (png_byte)filter_type;
181 info_ptr->interlace_type = (png_byte)interlace_type;
182 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
183 info_ptr->channels = 1;
184 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
185 info_ptr->channels = 3;
186 else
187 info_ptr->channels = 1;
188 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
189 info_ptr->channels++;
190 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
192 /* check for overflow */
193 rowbytes_per_pixel = (info_ptr->pixel_depth + 7) >> 3;
194 if (( width > PNG_MAX_UINT/rowbytes_per_pixel))
195 {
196 png_warning(png_ptr,
197 "Width too large to process image data; rowbytes will overflow.");
198 info_ptr->rowbytes = (png_size_t)0;
199 }
200 else
201 info_ptr->rowbytes = (info_ptr->width * info_ptr->pixel_depth + 7) >> 3;
202 }
204 #if defined(PNG_oFFs_SUPPORTED)
205 void PNGAPI
206 png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
207 png_int_32 offset_x, png_int_32 offset_y, int unit_type)
208 {
209 png_debug1(1, "in %s storage function\n", "oFFs");
210 if (png_ptr == NULL || info_ptr == NULL)
211 return;
213 info_ptr->x_offset = offset_x;
214 info_ptr->y_offset = offset_y;
215 info_ptr->offset_unit_type = (png_byte)unit_type;
216 info_ptr->valid |= PNG_INFO_oFFs;
217 }
218 #endif
220 #if defined(PNG_pCAL_SUPPORTED)
221 void PNGAPI
222 png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
223 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
224 png_charp units, png_charpp params)
225 {
226 png_uint_32 length;
227 int i;
229 png_debug1(1, "in %s storage function\n", "pCAL");
230 if (png_ptr == NULL || info_ptr == NULL)
231 return;
233 length = png_strlen(purpose) + 1;
234 png_debug1(3, "allocating purpose for info (%lu bytes)\n", length);
235 info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
236 png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
238 png_debug(3, "storing X0, X1, type, and nparams in info\n");
239 info_ptr->pcal_X0 = X0;
240 info_ptr->pcal_X1 = X1;
241 info_ptr->pcal_type = (png_byte)type;
242 info_ptr->pcal_nparams = (png_byte)nparams;
244 length = png_strlen(units) + 1;
245 png_debug1(3, "allocating units for info (%lu bytes)\n", length);
246 info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
247 png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
249 info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
250 (png_uint_32)((nparams + 1) * sizeof(png_charp)));
251 info_ptr->pcal_params[nparams] = NULL;
253 for (i = 0; i < nparams; i++)
254 {
255 length = png_strlen(params[i]) + 1;
256 png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
257 info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
258 png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
259 }
261 info_ptr->valid |= PNG_INFO_pCAL;
262 #ifdef PNG_FREE_ME_SUPPORTED
263 info_ptr->free_me |= PNG_FREE_PCAL;
264 #endif
265 }
266 #endif
268 #if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
269 #ifdef PNG_FLOATING_POINT_SUPPORTED
270 void PNGAPI
271 png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
272 int unit, double width, double height)
273 {
274 png_debug1(1, "in %s storage function\n", "sCAL");
275 if (png_ptr == NULL || info_ptr == NULL)
276 return;
278 info_ptr->scal_unit = (png_byte)unit;
279 info_ptr->scal_pixel_width = width;
280 info_ptr->scal_pixel_height = height;
282 info_ptr->valid |= PNG_INFO_sCAL;
283 }
284 #else
285 #ifdef PNG_FIXED_POINT_SUPPORTED
286 void PNGAPI
287 png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
288 int unit, png_charp swidth, png_charp sheight)
289 {
290 png_uint_32 length;
292 png_debug1(1, "in %s storage function\n", "sCAL");
293 if (png_ptr == NULL || info_ptr == NULL)
294 return;
296 info_ptr->scal_unit = (png_byte)unit;
298 length = png_strlen(swidth) + 1;
299 png_debug1(3, "allocating unit for info (%d bytes)\n", length);
300 info_ptr->scal_s_width = (png_charp)png_malloc(png_ptr, length);
301 png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
303 length = png_strlen(sheight) + 1;
304 png_debug1(3, "allocating unit for info (%d bytes)\n", length);
305 info_ptr->scal_s_width = (png_charp)png_malloc(png_ptr, length);
306 png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
308 info_ptr->valid |= PNG_INFO_sCAL;
309 #ifdef PNG_FREE_ME_SUPPORTED
310 info_ptr->free_me |= PNG_FREE_SCAL;
311 #endif
312 }
313 #endif
314 #endif
315 #endif
317 #if defined(PNG_pHYs_SUPPORTED)
318 void PNGAPI
319 png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
320 png_uint_32 res_x, png_uint_32 res_y, int unit_type)
321 {
322 png_debug1(1, "in %s storage function\n", "pHYs");
323 if (png_ptr == NULL || info_ptr == NULL)
324 return;
326 info_ptr->x_pixels_per_unit = res_x;
327 info_ptr->y_pixels_per_unit = res_y;
328 info_ptr->phys_unit_type = (png_byte)unit_type;
329 info_ptr->valid |= PNG_INFO_pHYs;
330 }
331 #endif
333 void PNGAPI
334 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
335 png_colorp palette, int num_palette)
336 {
338 png_debug1(1, "in %s storage function\n", "PLTE");
339 if (png_ptr == NULL || info_ptr == NULL)
340 return;
342 /*
343 * It may not actually be necessary to set png_ptr->palette here;
344 * we do it for backward compatibility with the way the png_handle_tRNS
345 * function used to do the allocation.
346 */
347 #ifdef PNG_FREE_ME_SUPPORTED
348 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
349 #endif
350 png_ptr->palette = (png_colorp)png_zalloc(png_ptr, (uInt)num_palette,
351 sizeof (png_color));
352 memcpy(png_ptr->palette, palette, num_palette * sizeof (png_color));
353 info_ptr->palette = png_ptr->palette;
354 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
356 #ifdef PNG_FREE_ME_SUPPORTED
357 info_ptr->free_me |= PNG_FREE_PLTE;
358 #else
359 png_ptr->flags |= PNG_FLAG_FREE_PLTE;
360 #endif
362 info_ptr->valid |= PNG_INFO_PLTE;
363 }
365 #if defined(PNG_sBIT_SUPPORTED)
366 void PNGAPI
367 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
368 png_color_8p sig_bit)
369 {
370 png_debug1(1, "in %s storage function\n", "sBIT");
371 if (png_ptr == NULL || info_ptr == NULL)
372 return;
374 png_memcpy(&(info_ptr->sig_bit), sig_bit, sizeof (png_color_8));
375 info_ptr->valid |= PNG_INFO_sBIT;
376 }
377 #endif
379 #if defined(PNG_sRGB_SUPPORTED)
380 void PNGAPI
381 png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
382 {
383 png_debug1(1, "in %s storage function\n", "sRGB");
384 if (png_ptr == NULL || info_ptr == NULL)
385 return;
387 info_ptr->srgb_intent = (png_byte)intent;
388 info_ptr->valid |= PNG_INFO_sRGB;
389 }
391 void PNGAPI
392 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
393 int intent)
394 {
395 #if defined(PNG_gAMA_SUPPORTED)
396 #ifdef PNG_FLOATING_POINT_SUPPORTED
397 float file_gamma;
398 #endif
399 #ifdef PNG_FIXED_POINT_SUPPORTED
400 png_fixed_point int_file_gamma;
401 #endif
402 #endif
403 #if defined(PNG_cHRM_SUPPORTED)
404 #ifdef PNG_FLOATING_POINT_SUPPORTED
405 float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
406 #endif
407 #ifdef PNG_FIXED_POINT_SUPPORTED
408 png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
409 int_green_y, int_blue_x, int_blue_y;
410 #endif
411 #endif
412 png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
413 if (png_ptr == NULL || info_ptr == NULL)
414 return;
416 png_set_sRGB(png_ptr, info_ptr, intent);
418 #if defined(PNG_gAMA_SUPPORTED)
419 #ifdef PNG_FLOATING_POINT_SUPPORTED
420 file_gamma = (float).45455;
421 png_set_gAMA(png_ptr, info_ptr, file_gamma);
422 #endif
423 #ifdef PNG_FIXED_POINT_SUPPORTED
424 int_file_gamma = 45455L;
425 png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
426 #endif
427 #endif
429 #if defined(PNG_cHRM_SUPPORTED)
430 #ifdef PNG_FIXED_POINT_SUPPORTED
431 int_white_x = 31270L;
432 int_white_y = 32900L;
433 int_red_x = 64000L;
434 int_red_y = 33000L;
435 int_green_x = 30000L;
436 int_green_y = 60000L;
437 int_blue_x = 15000L;
438 int_blue_y = 6000L;
440 png_set_cHRM_fixed(png_ptr, info_ptr,
441 int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
442 int_blue_x, int_blue_y);
443 #endif
444 #ifdef PNG_FLOATING_POINT_SUPPORTED
445 white_x = (float).3127;
446 white_y = (float).3290;
447 red_x = (float).64;
448 red_y = (float).33;
449 green_x = (float).30;
450 green_y = (float).60;
451 blue_x = (float).15;
452 blue_y = (float).06;
454 png_set_cHRM(png_ptr, info_ptr,
455 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
456 #endif
457 #endif
458 }
459 #endif
462 #if defined(PNG_iCCP_SUPPORTED)
463 void PNGAPI
464 png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
465 png_charp name, int compression_type,
466 png_charp profile, png_uint_32 proflen)
467 {
468 png_charp new_iccp_name;
469 png_charp new_iccp_profile;
471 png_debug1(1, "in %s storage function\n", "iCCP");
472 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
473 return;
475 new_iccp_name = png_malloc(png_ptr, png_strlen(name)+1);
476 strcpy(new_iccp_name, name);
477 new_iccp_profile = png_malloc(png_ptr, proflen);
478 png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
480 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
482 info_ptr->iccp_proflen = proflen;
483 info_ptr->iccp_name = new_iccp_name;
484 info_ptr->iccp_profile = new_iccp_profile;
485 /* Compression is always zero but is here so the API and info structure
486 * does not have to change if we introduce multiple compression types */
487 info_ptr->iccp_compression = (png_byte)compression_type;
488 #ifdef PNG_FREE_ME_SUPPORTED
489 info_ptr->free_me |= PNG_FREE_ICCP;
490 #endif
491 info_ptr->valid |= PNG_INFO_iCCP;
492 }
493 #endif
495 #if defined(PNG_TEXT_SUPPORTED)
496 void PNGAPI
497 png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
498 int num_text)
499 {
500 int i;
502 png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
503 "text" : (png_const_charp)png_ptr->chunk_name));
505 if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
506 return;
508 /* Make sure we have enough space in the "text" array in info_struct
509 * to hold all of the incoming text_ptr objects.
510 */
511 if (info_ptr->num_text + num_text > info_ptr->max_text)
512 {
513 if (info_ptr->text != NULL)
514 {
515 png_textp old_text;
516 int old_max;
518 old_max = info_ptr->max_text;
519 info_ptr->max_text = info_ptr->num_text + num_text + 8;
520 old_text = info_ptr->text;
521 info_ptr->text = (png_textp)png_malloc(png_ptr,
522 (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
523 png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
524 sizeof(png_text)));
525 png_free(png_ptr, old_text);
526 }
527 else
528 {
529 info_ptr->max_text = num_text + 8;
530 info_ptr->num_text = 0;
531 info_ptr->text = (png_textp)png_malloc(png_ptr,
532 (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
533 #ifdef PNG_FREE_ME_SUPPORTED
534 info_ptr->free_me |= PNG_FREE_TEXT;
535 #endif
536 }
537 png_debug1(3, "allocated %d entries for info_ptr->text\n",
538 info_ptr->max_text);
539 }
540 for (i = 0; i < num_text; i++)
541 {
542 png_size_t text_length,key_len;
543 png_size_t lang_len,lang_key_len;
544 png_textp textp = &(info_ptr->text[info_ptr->num_text]);
546 if (text_ptr[i].key == (png_charp)NULL)
547 continue;
549 key_len = png_strlen(text_ptr[i].key);
551 if(text_ptr[i].compression <= 0)
552 {
553 lang_len = 0;
554 lang_key_len = 0;
555 }
556 else
557 #ifdef PNG_iTXt_SUPPORTED
558 {
559 /* set iTXt data */
560 if (text_ptr[i].key != (png_charp)NULL)
561 lang_len = png_strlen(text_ptr[i].lang);
562 else
563 lang_len = 0;
564 if (text_ptr[i].lang_key != (png_charp)NULL)
565 lang_key_len = png_strlen(text_ptr[i].lang_key);
566 else
567 lang_key_len = 0;
568 }
569 #else
570 {
571 png_warning(png_ptr, "iTXt chunk not supported.");
572 continue;
573 }
574 #endif
576 if (text_ptr[i].text == (png_charp)NULL || text_ptr[i].text[0] == '\0')
577 {
578 text_length = 0;
579 #ifdef PNG_iTXt_SUPPORTED
580 if(text_ptr[i].compression > 0)
581 textp->compression = PNG_ITXT_COMPRESSION_NONE;
582 else
583 #endif
584 textp->compression = PNG_TEXT_COMPRESSION_NONE;
585 }
586 else
587 {
588 text_length = png_strlen(text_ptr[i].text);
589 textp->compression = text_ptr[i].compression;
590 }
592 textp->key = (png_charp)png_malloc(png_ptr,
593 (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
594 png_debug2(2, "Allocated %d bytes at %x in png_set_text\n",
595 key_len + lang_len + lang_key_len + text_length + 4, (int)textp->key);
597 png_memcpy(textp->key, text_ptr[i].key,
598 (png_size_t)(key_len));
599 *(textp->key+key_len) = '\0';
600 #ifdef PNG_iTXt_SUPPORTED
601 if (text_ptr[i].compression > 0)
602 {
603 textp->lang=textp->key + key_len + 1;
604 png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
605 *(textp->lang+lang_len) = '\0';
606 textp->lang_key=textp->lang + lang_len + 1;
607 png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
608 *(textp->lang_key+lang_key_len) = '\0';
609 textp->text=textp->lang_key + lang_key_len + 1;
610 }
611 else
612 #endif
613 {
614 #ifdef PNG_iTXt_SUPPORTED
615 textp->lang=(png_charp)NULL;
616 textp->lang_key=(png_charp)NULL;
617 #endif
618 textp->text=textp->key + key_len + 1;
619 }
620 if(text_length)
621 png_memcpy(textp->text, text_ptr[i].text,
622 (png_size_t)(text_length));
623 *(textp->text+text_length) = '\0';
625 #ifdef PNG_iTXt_SUPPORTED
626 if(textp->compression > 0)
627 {
628 textp->text_length = 0;
629 textp->itxt_length = text_length;
630 }
631 else
632 #endif
633 {
634 textp->text_length = text_length;
635 #ifdef PNG_iTXt_SUPPORTED
636 textp->itxt_length = 0;
637 #endif
638 }
639 info_ptr->text[info_ptr->num_text]= *textp;
640 info_ptr->num_text++;
641 png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
642 }
643 }
644 #endif
646 #if defined(PNG_tIME_SUPPORTED)
647 void PNGAPI
648 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
649 {
650 png_debug1(1, "in %s storage function\n", "tIME");
651 if (png_ptr == NULL || info_ptr == NULL ||
652 (png_ptr->mode & PNG_WROTE_tIME))
653 return;
655 png_memcpy(&(info_ptr->mod_time), mod_time, sizeof (png_time));
656 info_ptr->valid |= PNG_INFO_tIME;
657 }
658 #endif
660 #if defined(PNG_tRNS_SUPPORTED)
661 void PNGAPI
662 png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
663 png_bytep trans, int num_trans, png_color_16p trans_values)
664 {
665 png_debug1(1, "in %s storage function\n", "tRNS");
666 if (png_ptr == NULL || info_ptr == NULL)
667 return;
669 if (trans != NULL)
670 {
671 /*
672 * It may not actually be necessary to set png_ptr->trans here;
673 * we do it for backward compatibility with the way the png_handle_tRNS
674 * function used to do the allocation.
675 */
676 #ifdef PNG_FREE_ME_SUPPORTED
677 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
678 #endif
679 png_ptr->trans = info_ptr->trans = png_malloc(png_ptr, num_trans);
680 memcpy(info_ptr->trans, trans, num_trans);
681 #ifdef PNG_FREE_ME_SUPPORTED
682 info_ptr->free_me |= PNG_FREE_TRNS;
683 #else
684 png_ptr->flags |= PNG_FLAG_FREE_TRNS;
685 #endif
686 }
688 if (trans_values != NULL)
689 {
690 png_memcpy(&(info_ptr->trans_values), trans_values,
691 sizeof(png_color_16));
692 if (num_trans == 0)
693 num_trans = 1;
694 }
695 info_ptr->num_trans = (png_uint_16)num_trans;
696 info_ptr->valid |= PNG_INFO_tRNS;
697 }
698 #endif
700 #if defined(PNG_sPLT_SUPPORTED)
701 void PNGAPI
702 png_set_sPLT(png_structp png_ptr,
703 png_infop info_ptr, png_sPLT_tp entries, int nentries)
704 {
705 png_sPLT_tp np;
706 int i;
708 np = (png_sPLT_tp)png_malloc(png_ptr,
709 (info_ptr->splt_palettes_num + nentries) * sizeof(png_sPLT_t));
711 png_memcpy(np, info_ptr->splt_palettes,
712 info_ptr->splt_palettes_num * sizeof(png_sPLT_t));
713 png_free(png_ptr, info_ptr->splt_palettes);
714 info_ptr->splt_palettes=NULL;
716 for (i = 0; i < nentries; i++)
717 {
718 png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
719 png_sPLT_tp from = entries + i;
721 to->name = (png_charp)png_malloc(png_ptr,
722 png_strlen(from->name) + 1);
723 png_strcpy(to->name, from->name);
724 to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
725 from->nentries * sizeof(png_sPLT_t));
726 png_memcpy(to->entries, from->entries,
727 from->nentries * sizeof(png_sPLT_t));
728 to->nentries = from->nentries;
729 to->depth = from->depth;
730 }
732 info_ptr->splt_palettes = np;
733 info_ptr->splt_palettes_num += nentries;
734 info_ptr->valid |= PNG_INFO_sPLT;
735 #ifdef PNG_FREE_ME_SUPPORTED
736 info_ptr->free_me |= PNG_FREE_SPLT;
737 #endif
738 }
739 #endif /* PNG_sPLT_SUPPORTED */
741 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
742 void PNGAPI
743 png_set_unknown_chunks(png_structp png_ptr,
744 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
745 {
746 png_unknown_chunkp np;
747 int i;
749 if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
750 return;
752 np = (png_unknown_chunkp)png_malloc(png_ptr,
753 (info_ptr->unknown_chunks_num + num_unknowns) *
754 sizeof(png_unknown_chunk));
756 png_memcpy(np, info_ptr->unknown_chunks,
757 info_ptr->unknown_chunks_num * sizeof(png_unknown_chunk));
758 png_free(png_ptr, info_ptr->unknown_chunks);
759 info_ptr->unknown_chunks=NULL;
761 for (i = 0; i < num_unknowns; i++)
762 {
763 png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
764 png_unknown_chunkp from = unknowns + i;
766 png_strcpy((png_charp)to->name, (png_charp)from->name);
767 to->data = (png_bytep)png_malloc(png_ptr, from->size);
768 png_memcpy(to->data, from->data, from->size);
769 to->size = from->size;
771 /* note our location in the read or write sequence */
772 to->location = (png_byte)(png_ptr->mode & 0xff);
773 }
775 info_ptr->unknown_chunks = np;
776 info_ptr->unknown_chunks_num += num_unknowns;
777 #ifdef PNG_FREE_ME_SUPPORTED
778 info_ptr->free_me |= PNG_FREE_UNKN;
779 #endif
780 }
781 void PNGAPI
782 png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
783 int chunk, int location)
784 {
785 if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
786 (int)info_ptr->unknown_chunks_num)
787 info_ptr->unknown_chunks[chunk].location = (png_byte)location;
788 }
789 #endif
791 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
792 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
793 void PNGAPI
794 png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
795 {
796 /* This function is deprecated in favor of png_permit_mng_features()
797 and will be removed from libpng-2.0.0 */
798 png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
799 if (png_ptr == NULL)
800 return;
801 png_ptr->mng_features_permitted = (png_byte)
802 ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
803 ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
804 }
805 #endif
807 #if defined(PNG_MNG_FEATURES_SUPPORTED)
808 png_uint_32 PNGAPI
809 png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
810 {
811 png_debug(1, "in png_permit_mng_features\n");
812 if (png_ptr == NULL)
813 return (png_uint_32)0;
814 png_ptr->mng_features_permitted =
815 (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
816 return (png_uint_32)png_ptr->mng_features_permitted;
817 }
818 #endif
820 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
821 void PNGAPI
822 png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
823 chunk_list, int num_chunks)
824 {
825 png_bytep new_list, p;
826 int i, old_num_chunks;
827 if (num_chunks == 0)
828 {
829 if(keep == HANDLE_CHUNK_ALWAYS || keep == HANDLE_CHUNK_IF_SAFE)
830 png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
831 else
832 png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
834 if(keep == HANDLE_CHUNK_ALWAYS)
835 png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
836 else
837 png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
838 return;
839 }
840 if (chunk_list == NULL)
841 return;
842 old_num_chunks=png_ptr->num_chunk_list;
843 new_list=png_malloc(png_ptr,5*(num_chunks+old_num_chunks));
844 if(png_ptr->chunk_list != (png_bytep)NULL)
845 {
846 png_memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
847 png_free(png_ptr, png_ptr->chunk_list);
848 png_ptr->chunk_list=NULL;
849 }
850 png_memcpy(new_list+5*old_num_chunks, chunk_list, 5*num_chunks);
851 for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
852 *p=(png_byte)keep;
853 png_ptr->num_chunk_list=old_num_chunks+num_chunks;
854 png_ptr->chunk_list=new_list;
855 #ifdef PNG_FREE_ME_SUPPORTED
856 png_ptr->free_me |= PNG_FREE_LIST;
857 #endif
858 }
859 #endif
861 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
862 void PNGAPI
863 png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
864 png_user_chunk_ptr read_user_chunk_fn)
865 {
866 png_debug(1, "in png_set_read_user_chunk_fn\n");
867 png_ptr->read_user_chunk_fn = read_user_chunk_fn;
868 png_ptr->user_chunk_ptr = user_chunk_ptr;
869 }
870 #endif
872 #if defined(PNG_INFO_IMAGE_SUPPORTED)
873 void PNGAPI
874 png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
875 {
876 png_debug1(1, "in %s storage function\n", "rows");
878 if (png_ptr == NULL || info_ptr == NULL)
879 return;
881 if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
882 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
883 info_ptr->row_pointers = row_pointers;
884 if(row_pointers)
885 info_ptr->valid |= PNG_INFO_IDAT;
887 }
888 #endif
890 void PNGAPI
891 png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
892 {
893 if(png_ptr->zbuf)
894 png_free(png_ptr, png_ptr->zbuf);
895 png_ptr->zbuf_size = (png_size_t)size;
896 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
897 if(!png_ptr->zbuf)
898 png_error(png_ptr,"Unable to malloc zbuf");
899 png_ptr->zstream.next_out = png_ptr->zbuf;
900 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
901 }
903 void PNGAPI
904 png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
905 {
906 if (png_ptr && info_ptr)
907 info_ptr->valid &= ~(mask);
908 }